Verify Webpack Documentation

The documentation for Webpack didn't work for me

https://github.com/43081j/postcss-lit/blob/48c6f363faad026f151065fb61569f4db1fde688/README.md?plain=1#L33-L60

When I switched it around it started working as expected. Here's our order:

```
{
test: /\.ts$/,
use: [
'babel-loader',
'ts-loader',
'postcss-loader',
],
exclude: /node_modules/
}
```

We're on Webpack version 5 in a monorepo, though I don't think that matters much.

After further investigation, as your readme states "_postcss will transform your CSS before typescript transpiles_", Webpack loaders are executed in reverse order (see [Webpack's documentation](https://webpack.js.org/concepts/loaders/#configuration)). So we'd want `postcss-loader` last in the array so it can be first. I still don't understand why Webpack works this way, I'm sure there's a lengthy thread somewhere but it's illogical to me.

The issue points to a specific section of the README (lines 33-60) that describes Webpack configuration. The user found that the documented loader order is reversed relative to Webpack's execution order. To verify, read the linked Webpack documentation on loader execution, then check the README.md file around the mentioned lines. The fix is to update the example array so 'postcss-loader' appears last, ensuring it runs first. A test would involve setting up a minimal Webpack project with the corrected configuration to confirm CSS extraction works.

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